<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!-- action表单数据提交的地址 method提交返方式get/post -->
    <!-- 表单数据提交的地址 -->
    <form action="XXXX" method="post">
    <!-- 单行文本框 -->
    用户名:<input type="text"
    name='username'>
    密码<input type="password"
    name='password'> 
    <button>提交</button>
</form>
</body>
</html>